Combined multiple attenuation in marine seismic data processing
Guo Mengqiu1, Zhao Yanliang1, Zuo Shengjie2, Ba Jing3
1. LandOcean Energy Services Co.Ltd,Beijing 100084,China;
2. Sinopec Oil & Gas Australia Pty Ltd,Beijing 100083,China;
3. Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China
Abstract：This paper presents a multiple attenuation approach for Australian marine seismic data.In view of long path and peg-leg multiples significantly growing,comparisons of different multiple attenuation methods are made and the strategies of combined multiple suppression are proposed.The steps of multiple attenuation shows as follows: ①Radon transform is performed after the first round of velocity analysis to attenuate most of the long-path multiples.②Predictive deconvolution is used to attenuate most of the peg-leg multiples.③High precision Radon transform is performed after the second round of velocity analysis to attenuate residual multiples.④Radon transform plus inner mute is performed on CPR gathers to suppress peg-leg multiples with small time differences.The results prove the efficiency of this combined approach.Primary reflections are improved.
